Administrator



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RICHARD VOSE, OI" PHILADELPHIA, PENNSYLY ANIA, ADMINISTRATOR OF WILLIAM.BULLOGK,` DECEASED.

Letters Patent No. 100,368, dated March 1, 1870; antedated February 28,v12870.

IMPROVED MACHINE POR PLANIG- AND SQUARING- THE ENDS OF SEG-MENTALSTEREOTYPE PLATES.

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The Schedule referred to in these Letters Patent and making part of thesame To all whom it may concern Be it known thaty WILLIAM BULLOCK, lateof Philadelphia, in the county of Philadelphia, in the State ofPennsylvania, did invent anew and useful Machine for Shaving andSqnaring Circular' Stereotype Plates; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had tothe annexed drawingsinaking'a part of this specification, in which- Figure 1 is alongitudinal sectional elevation.

Figure 2 is an end view, and

Figure 3 is a panoramic plane of the machine.

This machine and improvement is intended to be used in preparing'circular stereotype plates for the press, it being essential thatstereotype plates should be of uniform and even thickness, so as toprevent the necessity of under or overlaying, and the edges should besquare with the axis 'and periphery of the cylinder,

to accomplish which with ldispatch is the object of this machine.

In the drawings hereto annexed- A is the iraine of the machine, lwithguides at the sides, iu-which the clalnp or hed B holding the plate Ccan be drawn backward and forwards hy means of the screw E and crank F,for the purpose of passing the plate under the revolving knives orcutters G, in order to planethe iunerorconcave surface of-the plate andsquare the ends.

H is the shaft driven by a belt on the pulley I, on the opposite end ot'which is secured a circular disk, J, to which is attached the adjustablecutters G G, bolted on to the face of the disk by screws L L', enablingthe operator to set the knives or cut-ters to the proper point.

B is the sliding bed, which may he moved backward and forward under therevolving cutters G G and between the guides M IVI, iig. 2, on thebed-plate A, by means of the screw E and crank F.

K K are clamps on the sides of the sliding bed B, regulated by twoscrews, but for some purposes one or more screws may be preferable forthe purpose of holding and forcing the plate into a true circle, theshape required for the press.

lN is a spring, forcing thedog O up through the stationary bed-plateorframe A, for the purpose of checking the movable bed-plate B at theproper point in trimming the ends.

P is a check, to hold the dog from going 'through the under plate Awhilst the inner or concave surface of the plate is being shaved.

Like letters represent the saine Aparts in the different drawings. Whenthe stereotype plate is taken from the mould and the sides are properlytrimmed, it is placed in the bed B, which should be previously preparedfor it by loosening the clamps and screw or screws on one side andplacing a sheet of card paper in the bed to lie hetween the bed andthe'type surface of the plate. The clamp-screw or screws are thentightened for the twofold purpose of holding the plate and pressing itinto the proper shape. Then the back of the plate should be evenlypounded with a mallet prepared for the purpose, so as to force thetype-surface into even cont-act with the card paper, thereby making thetype-surface even and uniform. The trinnning knife or knives are theninserted and made to revolve. drawn up gradually to the revolvingknives, by which it is trimmed and squared until checked by the dog. Thespring N is then pressed down, the bed moved to the other end, which isthen treated in the saine manner. Another knife or knives are theninserted in the disk, the dog sprung back and held by the check,

P, and the bed B drawn slowly under the revolving knives by means of thescrew E and crank F, thereby shaving the back of the plate or concavesurface, and forcingthe convex surface into a true circle, giving theconvex or type surface a perfectly even and level surface, and makingthe plate perfectly even in tliickf ness.

What I claim as the invention of the said WILLIAM BULLOCK, and desire tosecure by Letters Patent, 1s-

The movable circular bed, in'coinbination with the revolving knives orcutters, all constructed and arranged as and for the purposes described.f

RICHD. VOSE,

Administ'llator.

Witnesses A. L. BUTLER, Jas. GILLET.

The bed is then

